Reformable closure device strap

ABSTRACT

A strap for a mechanical closure device is disclosed. The strap includes a wire disposed along a longitudinal axis of the strap. The wire maintains the strap in a desired geometry that is different from a previous geometry of the strap. In other embodiments, a wire-core strap can include transverse ridges, holes, or other types of grooves or apertures.

BACKGROUND

The present invention relates generally to mechanical closure systems, and more particularly to a preformed strap that is reformable by a user into a desired geometry that is different from an original geometry.

Mechanical closure systems are used extensively in the sports, medical and transportation industries. These closure systems typically use plastic strap such as a ladder strap. A ladder strap is formed with a top side that includes a number of transverse ridges that are sequentially engaged by a latching mechanism. In the sports industry, for example, mechanical closure systems are used in harnessing devices on such items as snowboard bindings, ski boots, wake board bindings and inline skates.

For most applications, conventional straps such as ladder straps are purposely preformed with a curved geometry where the top side is convex and a bottom side is concave, so as to enclose around an object such as a foot or limb, or a part of a device. Alternatively, conventional straps are preformed flat and straight, with no curvature. However, regardless of an original geometry, conventional straps are made to resiliently return to that original geometry.

The preformed geometry of conventional straps can interfere with easy ingress and egress of an object in a mechanical closure system. In fact, conventional straps may become bent unnaturally by the object or caught on a sharp edge of a device onto which the object is held or enclosed. In the sport of snowboarding, for example, a user needs to manually hold open a padded boot enclosure system in order to step into a binding, and very often in inclement environments. The straps, in their original geometry, may be stepped on or held too far beyond a desired or useful geometry, leading to breakages or weakening of the straps.

SUMMARY

This document discloses improved plastic straps for mechanical closure systems, and systems and devices employing the same.

In one aspect, a closure apparatus includes a strap. The strap includes a wire disposed along a longitudinal axis of the strap. The wire maintains the strap in a desired geometry that is different from a previous geometry of the strap. In other aspects, a wire-core strap can include transverse ridges, holes, or other types of grooves or apertures.

According to a specific aspect, a mechanical closure device includes an elongated thermoplastic ladder strap having a top face that includes a number of transverse ridges and an aperture. The mechanical closure device further includes a U-shaped metal wire embedded in the ladder strap that partially circumscribes the aperture and extends in parallel along a major portion of a longitudinal axis of the ladder strap, the U-shaped wire being adapted to maintain the ladder strap in a desired geometry that is different from a previous geometry of the ladder strap.

The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features and advantages will be apparent from the description and drawings, and from the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects will now be described in detail with reference to the following drawings.

FIG. 1 depicts a snow sport binding mechanism.

FIGS. 2A-C are various views of a ladder strap.

FIGS. 3A and 3B illustrate alternative embodiments of a closure device.

FIG. 4 depicts an inline skate having a closure device.

Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION

This document describes closure devices. In particular, this document describes a wire-core strap that is bendable from an original or enclosing geometry to a desired or opened geometry, enhancing the safety and ease of use of such closure devices. The embedded wire provides tensile strength and an ability to maintain a form or a bend into a desired geometry, and resists reforming the strap into its previous geometry without external influence. These straps can be embodied as ladder straps, also called ratchet straps, which can be used for mechanical closure systems in sports (bindings for snowboards, snowshoes, in-line roller skates, etc.), medical (orthotics, prosthetics, stabilization boots, spinal stabilizers, etc.), and transportation (car-top carrier systems or roof racks, etc.) applications. Other applications are possible and within the scope of this document.

FIG. 1 shows a snowboard binding 100 to illustrate one application of a closure device in accordance with embodiments herein. The snowboard binding 100 includes a rigid base 50, a rigid foot and heel support member 60 extending up from opposing sides of the base 50, and a pivotable back ankle support member 70 connected to the rigid foot and heel support member 60.

The snowboard binding 100 further includes one or more padded mechanical closure systems for enclosing a boot or foot of a user. Each mechanical closure system can include one or more ladder straps 102. Each ladder strap 102 includes a top side 104, at least a portion of which can have a number of transverse ridges that can be sequentially engaged by a locking tang of a ratcheting receptor 106. Each ladder strap 102 includes a wire (not shown), either embedded within the strap or disposed thereon, that allow the ladder straps 102 to be maintained in a geometry 103 that is different from a preformed geometry. Thus, the padded part of the mechanical closure system can also be held in an open position 101 as well, for easy ingress and egress of a boot into and out of the snowboard binding 100.

FIG. 2A shows a perspective view of a closure device 200 that is formed according to preferred embodiments described herein. FIG. 2B is a side view along the longitudinal axis L of the closure device 200, and FIG. 2C is a top-down view onto the top face 204 of the closure device 200. The closure device 200 includes an elongated ladder strap 202 having a top face 204 that includes one or more transverse ridges 206. The transverse ridges 206 are for engaging with a tang of a ratcheting receptor. Alternative embodiments of a closure device 200 include a strap with a smooth top face 204, with any number of holes or grooves for engaging a receptor mechanism, as is described with reference to FIGS. 3A and 3B.

The ladder strap 202 may also include an aperture 208 that is preferably positioned and aligned in the middle of one end of the ladder strap 202. The ladder strap 202 can be any length, width or thickness, but must be formed of a material of such thickness and density so as to be bendable to various geometries. Preferably, the ladder strap 202 is longer in a longitudinal axis (L) than a transverse axis (T) so as to be elongated.

The closure device 200 further includes a wire 210 embedded within the ladder strap 202. In an exemplary embodiment, the wire 210 includes is a U-shaped metal wire having two parallel arms. The U-shaped metal wire can be positioned to at least partially circumscribe the aperture 208 for additional strength near the aperture 208, such that the arms extend in parallel along a major portion of a longitudinal axis L of the ladder strap 202. The wire 210 is adapted to maintain the ladder strap 202 in a desired geometry that is different from a previous geometry. For example, in a snowboard binding as shown in FIG. 1, the closure device 200 can be opened away from the base to allow a user easy and catch-free ingress into and egress from the binding.

FIGS. 3A and 3B illustrate alternative embodiments of a closure device 300 and 301, respectively. The closure devices 300 and 301 include a strap 302 having one or more holes 304 through the strap 302. The straps 302 are generally flat and elongated, but can be of any length, width or thickness. The holes 304 are preferably centered and uniformly spaced, and generally rounded. However, the holes 304 can be positioned anywhere within the strap 302, and may include an elongated slat 305 as shown in the strap 301 of FIG. 3B.

A geometry of the strap 302 is maintained by a wire 306 that is preferably embedded in the strap. The wire 306 can include generally parallel arms connected to a U-shaped portion 307 of the wire. The U-shaped portion 307 can be positioned at a periphery of one end of the strap, and may at least partially circumscribe an aperture 310 provided at that end, so as to provide further strengthening of the end of the strap.

FIG. 4 shows an inline skate 400 to illustrate yet another application of the closure devices described herein. The inline skate 400 includes a shoe 402 to receive a skater's foot, the shoe being mounted on a number of aligned wheels 404. The shoe can be enclosed around a skater's foot and ankle by engaging a ladder strap 406 into a receptor mechanism 408. When not so engaged, each ladder strap 406 includes a wire disposed along a longitudinal axis so that the strap can be bent outwardly and maintained in an open geometry as shown, so that a skater may insert or remove their foot without catching it on the ladder straps 406.

In preferred embodiments, each strap is formed of thermoplastic or thermoplastic polyurethanes that can withstand shock and adverse weather conditions and wild swings in temperature. In specific preferred embodiments, straps are formed of a thermoplastic polyester elastomer, such as Hytrel®, to provide the flexibility of rubbers, the strength of plastics, and the processibility of thermoplastics. The straps can be made using any thermoplastic processes like injection molding, extrusion and meltcasting.

Although a few embodiments have been described in detail above, other modifications are possible. For example, the wire may be bonded or otherwise attached to a surface of the strap, and need not necessarily be embedded within the core of the strap. Other embodiments may be within the scope of the following claims. 

1. A mechanical closure device comprising: an elongated thermoplastic ladder strap having a top face that includes a plurality of transverse ridges and an aperture; and a metal wire embedded in the ladder strap and having a U-shaped bend that partially circumscribes the aperture about a first axis, the metal wire further having spaced-apart arms that extend in parallel along a major portion of a longitudinal axis of the ladder strap, the, the spaced-apart parallel arms being reformable about a second axis that is orthogonal to the first axis to maintain the ladder strap in a desired geometry that is different from a previous geometry of the ladder strap.
 2. A mechanical closure device in accordance with claim 1, wherein the thermoplastic ladder strap is comprised of a thermoplastic polyester elastomer.
 3. A binding mechanism for a boot or a foot of a user, the binding mechanism comprising: a rigid base; a rigid foot and heel support member extending up from opposing sides of the base; a pivotable back ankle support member connected to the rigid foot and heel support member; and a mechanical closure device, connected to the rigid foot and heel support, for enclosing the boot or the foot of the user, the mechanical closure device comprising: a ratcheting receptor having a locking tang; and a ladder strap that is received into the ratcheting receptor, the ladder strap including a plurality of transverse ridges for being sequentially engaged by the locking tang, and further including a metal wire embedded therein, the metal wire including a U-shaped bend about a first axis and spaced-apart arms that extend from the U-shaped bend along a major portion of a longitudinal axis of the ladder strap, the spaced-apart arms being reformable about a second axis that is orthogonal to the first axis to maintain the ladder strap in an open geometry provided by the user that is different from an enclosing geometry of the ladder strap when the mechanical closure device is enclosed around the boot or foot of the user.
 4. A binding mechanism in accordance with claim 3, wherein the ladder strap is formed of a thermoplastic.
 5. A binding mechanism in accordance with claim 3, further comprising a padding attached to the mechanical closure device. 